CVE-2022-49034

Runtime warning via out-of-range CPU iteration

Published Dec 27, 2024 · Updated May 11, 2026

Out-of-range CPU iteration in the Linux kernel allows local users to trigger a runtime warning by reading /proc/cpuinfo. The SH show_cpuinfo path iterates to the compile-time NR_CPUS limit, causing cpu_max_bits_warn() when the runtime nr_cpu_ids mask is smaller. The condition requires CONFIG_CPUMASK_OFFSTACK and CONFIG_DEBUG_PER_CPU_MAPS; it normally emits diagnostics, but a panic-on-warning policy causes a kernel panic.

CVSS severityUnavailable
Unscored
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-range CPU iteration in the Linux kernel allows local users to trigger a runtime warning by reading /proc/cpuinfo. The SH show_cpuinfo path iterates to the compile-time NR_CPUS limit, causing cpu_max_bits_warn() when the runtime nr_cpu_ids mask is smaller. The condition requires CONFIG_CPUMASK_OFFSTACK and CONFIG_DEBUG_PER_CPU_MAPS; it normally emits diagnostics, but a panic-on-warning policy causes a kernel panic.

The record

CVE
CVE-2022-49034
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <09faf32c682ea4a547200b8b9e04d8b3c8e84b55
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b6b8e011fab680a223b5e07a3c64774156ec6fe
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <39373f6f89f52770a5405d30dddd08a27d097872
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c891f7c6a4e90bb1199497552f24b26e46383bc
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <701e32900683378d93693fec15d133e2c5f7ada2
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <77755dc95ff2f9a3e473acc1e039f498629949ea
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8fbb57eabfc8ae67115cb47f904614c99d626a89
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e2b91997db286a5dd3cca6d5d9c20004851f22eb
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f8f26cf69003a37ffa947631fc0e6fe6daee624a
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <09faf32c682ea4a547200b8b9e04d8b3c8e84b55; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b6b8e011fab680a223b5e07a3c64774156ec6fe; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <39373f6f89f52770a5405d30dddd08a27d097872; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c891f7c6a4e90bb1199497552f24b26e46383bc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <701e32900683378d93693fec15d133e2c5f7ada2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <77755dc95ff2f9a3e473acc1e039f498629949ea; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8fbb57eabfc8ae67115cb47f904614c99d626a89; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e2b91997db286a5dd3cca6d5d9c20004851f22eb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f8f26cf69003a37ffa947631fc0e6fe6daee624a; version=2.6.12

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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Technologies

Your stack

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Your stack

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